Is this something specific to Poland. I join Zoom calls via a browser (on a PC) all the time - it was not at all hard to figure out.
When I clicked the zoom link it opens a browser window and pops up a system dialog to launch the zoom app. After I hit "cancel" on that dialog I was on a page with a large "Launch Meeting" button (and no link to use the web version). Then, I clicked the "Launch Meeting" button and it opened the same system dialog again. Then, after I clicked cancel on that dialog a small link appeared at the bottom that says: "Having issues with Zoom Client? Join from Your Browser"